Lemsip is a brand of cold and flu remedies in Ireland, the United Kingdom, Australia and New Zealand. It is manufactured by Reckitt Benckiser. Their original and best-known product is a lemon-flavoured hot drink (hence the lem in Lemsip) containing 650 mg of paracetamol (an analgesic), and 10 mg phenylephrine hydrochloride (a decongestant) to help to relieve headache, fever, blocked nose, body aches and pains and a sore throat. In 1995 The Lemsip Max platform was launched which included a Lemon, Blackcurrant and Breathe Easy hot drink flavours, and saw a variety of capsule products added to the range, including Lemsip Max Cold & Flu Capsules. The entire Lemsip Max range contains the maximum level of active ingredients allowed for general sales listing in the UK.

Info gleaned from Wikipedia